Fabric Watch Administrator’s Guide 75
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Port fencing
7
Recommended high port fencing thresholds
It is recommend you use conservative thresholds to prevent false triggers. Examples for the Invalid
Transmitted Words and Invalid CRCs are shown in Table 19.
Recommended low port fencing thresholds
Set in-between thresholds to much lower values with an alerting action (RASlog, SNMP trap, or
e-mail). Examples for the Invalid Transmitted Words and Invalid CRCs are shown in Table 20. These
alerts will trigger when the count exceeds the low threshold.
Port fencing configuration using the portFencing command
The portFencing command enables and configures the port fencing feature; it does not set the
thresholds for port fencing. You must configure port thresholds with the portThconfig command
before you can enable port fencing.
Use the --disable option to disable port fencing for the specified areas on all ports of the specified
port types. Use the --show option to display the configuration. The display includes the configured
port types, error types, and port fencing status (disabled or enabled). Port fencing is disabled by
default.
You can configure a specified port type or a list of port types to enable port fencing for one or more
areas. Use the all option to indicate all port types or all areas.
Port fencing configuration on the VE_Port is supported on the FR4-18i router blade and the Brocade
7500 extension switch only. It is not supported on the Brocade 7800 extension switch or the DCX
extension blade.
TABLE 19 High port fencing threshold recommendations
Area
High threshold
(per minute)
E_Ports
High threshold
(per minute)
Storage
FOP_Ports
High threshold
(per minute)
Host
FOP_Ports
Default
Invalid transmitted words (ITW) 40 80 1000 1000
Invalid cyclic redundancy check
error (CRC)
20 40 1000 1000
TABLE 20 Low port fencing threshold recommendations
Area
Low threshold
(per minute)
E_Ports
Low threshold
(per minute)
Storage
FOP_Ports
Low threshold
(per minute)
Host
FOP_Ports
Default
Invalid transmitted words (ITW)2525251000
Invalid cyclic redundancy check
error (CRC)
5551000
